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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b342feec31cc4c362e3fbad365a5d15efa24170a2c961fa44ff41071d1c9995' 
  AND token = 'C90GyXNk8Nib3Mm4DO75H/28yx50r25rMLTuXsewMyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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