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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705b1f4f2b8c16001279d1f1bb8d005bd522ac60f2f4f2830aab7dd06a991914' 
  AND token = 'XJhPwCR6U6syHMtdlu/JqoWdOJ9068dKrbNowCxHrWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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