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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bd97005fe5956c12efaa2ae27ec46a4ba59b11ccdecfe9906574746f1841e7' 
  AND token = 'vajgk+eGPElnZBROQ8i69fD5mrq1Sccr39vp7soukgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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