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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d936f5218dd93efbbb56288063d964e9656adf2a7e750196a53ee284cbee5b3' 
  AND token = '0qHP2+Yop1R9qVZ07oHajnjAdDO8HFsBMVdZUH1DWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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