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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755c2b33b97844acc0817f8696a7d82cbdc6fcfa3f2c3b10d9bbc0b4d893b0b0' 
  AND token = 'IhKfwB6mbADkccVOlcuaSw2ZH87QWb7WVHqpf7E2eHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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