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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9346c09e77e604d3c54961529e6e327d8a7f31d893d576ae35a6df85ccc006c7' 
  AND token = 'nM+Zzw8omEbJYVOCrsUv5caXpHafE9cWv7owJM0AasE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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