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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c938b03e768c85ddf61e4f91a72a7188b6c3e0ef3195aa10f344f316f5a693' 
  AND token = 'q9CSUmBeKuAli4U20ki8SmOfsU8ox+gx9hidEK4aakc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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