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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac9040dbf584b55b4ef2303b548b1bfb21470a01b9491755b6468df3ebe0880' 
  AND token = 'rhqRM3QZquymhEfrMXnc9I8Imqx/SMNIjd7SydUsFTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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