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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3e5cd030f1d7c1e33607e406c3c7d82af190335a1625ccafca6dc1b630bfcb' 
  AND token = 'szXhEb7JAfK8GGZhyaSH3flbngZH+db5u1viL3b5vH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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