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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70abf0ddcf4493f4b1672263357746e0b693ec544f5b0b9d603ef07d801075a' 
  AND token = 'mtkfNdX8F4YNxzaWcGviOCJzdPUJe4u2msN3jG5EUVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}