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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abddf4ef394741db04e5b007eed7470c550bbc104a9c6c0a40928ceffa529dee' 
  AND token = '+Drp0bxafZYwFuDH/KaQomdsUEzs0lFK5q8lOj4srXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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