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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8b1654f611161f9e20b3e5ee8b4868c9d8c13b0af10e049d94c0c1330e9746' 
  AND token = 'Ng44lw29Ta0O6Z4zeWjZ2nkaBG7sKoAtyv9ZDZNYXm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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