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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7547b1ae2046efca6e06dc4054d8ea7b0e8e6aede15b3ecc5eb8c452649104f5' 
  AND token = 'LpJVnk0kaCNh+Yt1K0CXiKzCtCuiqRm/dI0RAYaqkf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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