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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660bd649bff283c03804cf451d36b990249af462a245e09288d4f7c49059f391' 
  AND token = 'sDaFAAKU7oLGd8wk/TthEQ+CF9et21L/E5BXPbmozng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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