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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901401aad91bb041d6319e9e7b13c85f9698bf0364ca47a15c4820f91e20d170' 
  AND token = 'OzOKk3pEMQV9+C0N6PSe0p9Hn+QZPxYHnM8mvBl6NHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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