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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c460ed09f56ca4e36322680174876d0999bb58ff79bac96787311b92fb256e4c' 
  AND token = 'qFB6vgW6OkEUVyZg/wOoaJ6q8dsUstWxHrI905SaVuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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