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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe84fd2ae49c1ad55e049a8ebe50d8f55ca43239790fe79bff38d6fabc4b5c8' 
  AND token = 'hO8RTPMGmcPfkugeGbry9MCqORgFx3Va0r2p97J4Ozg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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