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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b8ebd7a137ae2d6169c4b7c133725d84ffb60514089d23d6b602a90e1c705b' 
  AND token = 'yOM6vSdZ1kZOhwKpO5FLDZr4nbWI5WVUprK8ab00Y94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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