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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a051fc928e5ca8c39324d3c32f650aac5b6ed0aeed4c56212412dfe0249de70c' 
  AND token = '6AmWmbCbQ4+aCU9/mt+VtPRW87GOW8glFkvprdT1bUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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