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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177b52557dd8f7fe444dba3b54efa37b83260d53f7fdd62fd0bb0b31fd36754d' 
  AND token = '7Sd0RDehMX0qTxi5ZIdaHHDg9KfOAjWwSvm2tHVfMZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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