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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6cb30da51b18de99d9cabf3a60edfe02c6cd785619c2f8201b16312fa9bad4' 
  AND token = 'R8Hd5ClhEln/sBusbOONh5Wv6C3NTjFU3q/56F1e6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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