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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d34a457a4cd4a8456830c377a0c0a36cfd3cecd99a3b97d7b56b39a54a9d99' 
  AND token = 'RFXe6GjKu3N0g+tmWqcXJwCE2segxe5SSB0m695/13A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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