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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf932150779b5260bc00ba087d0f9483fbe8c6d007aaf4ea83c3db8dfaf8dc6' 
  AND token = 'y9ARhhRwuFh74Fnh3HVl2DyOARQHqfFUDX2uNYDd4oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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