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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823b6126867ff1d3881615719f5b4381d72ad55fee2cddce1f652054baa3e56b' 
  AND token = '7S8DleLtCzZ1+vtRI8PuIce3T9KB3YZAc9GXrOMimjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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