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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ad4872f325b3c6fc56c57de346c15a77147103380d0c2099e24307e003846c' 
  AND token = '9tUc5NG0O4UTn+Fa0xRFOU3d+xDphHoKgj1l3+xfpgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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