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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae10b7db57e6ddcac2a1f9bcccccc7d9168acdd121fbfdd1229cf4b212175b7' 
  AND token = 'Rie9uzKNC8/0x36880lHA8YOMb/wXDz/6tM73IrrcZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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