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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5b31f09b52227c89201f97b75350028eb6acc0859cdb1b8aad268927711f1e' 
  AND token = 'mJUwb7fE/EVV1/rpu8Fu4c56H0jepHfVWmesM2F3W/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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