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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45dd7793ad5c942f3cdb6dfe14ae477b40e07d36c8516ecdf5bf864fb721a1a9' 
  AND token = 'EA7GEsps/ECeO3V/IyizohSmW+T6EVP1K1tIiaxS0fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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