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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd31f1ad7d8a368b640b921ca3a714d94b0f0f3e295bb2b92ac23063d5d1fef3' 
  AND token = 'LxaKQlNAbHoGCrpmwCdCIavcBTaweC81qCDAltr4KWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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