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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3910f3e296c86d5cd1fd061f385231a7d7178ba514ac44ad9b2a7fb2762b8c' 
  AND token = '1Ev3M7tOdU7As0HAnUpJksFMAJR25e6k3qC1ikrUpAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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