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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2630e83c05e2a673331a3f12656716947f651755cb3a33deb1bb0464b377ee' 
  AND token = 'J8Kq8lqgrD5Ou1SFkMbXA1qELYeJJ0vcDG4+O7v6RyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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