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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aab0efeb2ec37d18dccb9cc2b01c644a37d3dcef6e3d45eb023c9f01d82468' 
  AND token = 'E+SOoGnVbLS6LCM7Z0MGhuZjGSS/ynLkJt+EzrjbSHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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