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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327560f968965aaac2efb3f802b8518deda5831a6223c74a0b23ea04a2926d07' 
  AND token = '2fOz6DDI/M4QHLd6ljdSqpvvzFdoOuuOmQIl8X0nvQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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