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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e5f09ec7dd82b3802e7a3dbe1a9bb92cee0f2a3d07f7dd30bbfe7b7d3f1e8e' 
  AND token = 'wDrmO5zt84H9F2UBt+EDo4Q7lWcLWf0SGiYXT5k7rH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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