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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983ef2f7929a6831be6c0c9090ca0da48914c5bc3bc1978f657ab28596db0257' 
  AND token = 'dn4xsmpCbiQWiqW7kpSDmAt1gfXHPDr6GvhskAmRhN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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