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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2f7c1b82d88d6cbe9a420912769cb56b3350d2785e74db1c04748685bdfea0' 
  AND token = '9W38ObBvAPiU31WOK6kQZ+cMFqbyFR3YYGyMIRZhJy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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