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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d98352d32247f828e5c87329f4cc545c9cff72dcb07ba375aa3f33c254b0dc4' 
  AND token = 'sndbJFpqPr2nSSjCQuIxHYjaJd9DmSu94uzOfi57tmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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