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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c2bfbd59b392370d8d0719f22fcddb5f591b27abaa7e1935443ec7f787cc60' 
  AND token = 'vabORvJ1KG7tjkJGpnndd9Qc83ShA1Ggz9fkSsFVm3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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