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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b98d37783e604f5637572719859a4c6dc5d1f1f1e842299c2dd1df64eb95eb' 
  AND token = 'VO7oOLb0sp3YS5KGPpBmFQfqSJOWCE7nPxbPNFyVEtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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