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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba57a484c8e448842a5779a2efa8a7f46fd4163c7d9cefc4b7b44092f238713' 
  AND token = '6PG7udzMyHtu6mgx1HEIHGA5y1O8FNnvzYA427eLbHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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