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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c840b0ec06750d430f2c65d9f155f9b2f5fa8dc3cb035d41e6ed3efec33f5dd5' 
  AND token = 'B/GlKwQZbe+0mJleiIvm5iib4hYIba85b5mzUN7slfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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