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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c38ddb587ef115fae6fdb2d4424f7644bdff19b0226f3d902c5d79b5ae3f2c' 
  AND token = '7DRPuypkx+r/ftVyx07L6Svht9xPhGUClZL2lsGyug0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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