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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3636e15a6a6c9a8e58dfc9d4d31126f2eb0edf8ed57b674e707b1636524b28ab' 
  AND token = 'abIA9/53J2TM4p0mRHc3R0wj2OoCVDs8Mir0Nn9tP6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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