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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c912d5212a7971d16af96c75c407648845a3fa68055dce3a3d84081bb06e1d' 
  AND token = '1cBc+7NyM1VDlurI2qj9K2iPiHxNPNTMdw35klZcbs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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