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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd3660fe7b5985f7244112238ee11f12541b9b6ee0bce61744fd3523b6b39b0' 
  AND token = 'JLN5XdgdzVuArfMEMM78AJjYJybBUVmaVRGmmQuu3cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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