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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a835e0d379ecc319aaf9f566d421aa2a52728615991c8a79d0b76edd926030d5' 
  AND token = '0QFXzuAY2BSTv9JCzmb0YaYBoe3w7Z8J6iLGC5bZdW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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