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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb1b923887652b56ae6730c7f2d1787ed6896848495b3fbb2b1206e05d69f9a' 
  AND token = 'n3lONqRUTPdCDH9yr3XLHKaB0bYNgaKV/63Ztvsu548=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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