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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c4c5e390f492f9a37967cc30bbe1f4c1ed5d7d5ada6f2b61416d86b9c0f1ac' 
  AND token = 'HXTlq8+ShG6AGTxEe8aKxVteUH2icgYw4kKZlk2qtxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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