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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72f19e1340ef8658434174d0e065018f5ab684203350191b42856f98a57230d' 
  AND token = 'YieRwAD1EDLx4mVOPc39hIlnrxYcs0mVwj203pwo0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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