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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6b96b03bc14ff5afc227f9c45f733abd570ce2997995d89b0685ecf40aebdc' 
  AND token = 'NSardAe49Lb+6TD2luj8ztsvl7kI7yh9oa6sOl2yR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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