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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455550a715070043a56d55b168a3d1aacef5acea1c25365c145e339579d05926' 
  AND token = 'Ns9bBgVgmyk4UXUktP6tXnsqWPev7F+Yu87mvXQ6IRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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